The question asks, what is the average value of the output voltage fro the circuit.

The choices are; 5.48v 2.74v 0v and 6.37v

I choose 6.37v using a simple formula; 2(160)/pie then divid by 16. Also tried accounting for .7v through diode, however, the book says the answer is 5.48v. Could the book have made an error with their answer?